I'm sorry but I have to strongly disagree with this statement. Transcribing solos by Jaco, Wooten, Ray Brown, Ron Carter, Charlie Parker, Miles Davis, Jimi Hendrix, or whatever players/genres you enjoy, is an
essential step to becoming a master soloist.
An analogy is if you want to become a great public speaker/orator. Can you learn how to do that by practicing your spelling and grammar? Of course not, you
must study the great speeches by Lincoln, JFK, MLK, etc. if you hope to master this art form.
Don't take my word for it. First enjoy this lovely Stevie Wonder song:
Does it sound good because: A) Victor has a solid theoretical understanding of all the scales, chords, and modes, or B) Victor loves this song, has listened to it a thousand times, and has learned every note?
Not sure how you can label the process of learning the song over which you want to solo a "shortcut" and "very bad thing." If you are instructing the OP that it's possible to learn to solo like Jaco/Victor/etc. without learning any Jaco/Victor/etc. solos, I think that is seriously misguided advice.